Mercurial > hg
view relnotes/5.6 @ 51108:0250e45040f1
revlog: add a small cache of unfiltered chunk
This can provides a massive boost to the reading of multiple revision and the
computation of a valid delta chain.
This greatly help operation like `hg log --patch`, delta computation (helping
pull/unbundle), linkrev adjustment (helping copy tracing).
A first round of benchmark for `hg log --patch --limit 1000` shows improvement
in the 10-20% range on "small" repository like pypy or mercurial and large
improvements (about 33%) for more complex ones like netbeans and mozilla's.
These speeds up are consistent with the improvement to `hg pull` (from a server
sending poor deltas) I saw benchmarking this last year. Further benchmark will
be run during the freeze.
I added some configuration in the experimental space to be able to further test
the effect of various tuning for now. This feature should fit well in the
"usage/resource profile" configuration that we should land next cycle.
When it does not provides a benefit the overhead of the cache seem to be around
2%, a small price for the big improvement. In addition I believe we could shave
most of this overhead with a more efficent lru implementation.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Fri, 27 Oct 2023 08:54:41 +0200 |
parents | 84eb4c833c41 |
children |
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== New Features == * `hg mv -A` can now be used with `--at-rev`. It behaves just like `hg cp -A --at-rev`, i.e. it marks the destination as a copy of the source whether or not the source still exists (but the source must exist in the parent revision). * New revset predicate `diffcontains(pattern)` for filtering revisions in the same way as `hg grep --diff pattern`. * The memory footprint per changeset and per file during pull/unbundle operations has been significantly reduced. == New Experimental Features == == Bug Fixes == == Backwards Compatibility Changes == == Internal API Changes == * `merge.update()` is now private (renamed to `_update()`). Hopefully the higher-level functions available in the same module cover your use cases. * `phases.registernew` now takes a set of revisions instead of a list of nodes. `phases.advanceboundary` takes an optional set of revisions in addition to the list of nodes. The corresponeding members of the `phasecache` class follow this change. * The `addgroup` member of `revlog` classes no longer keeps a list of all found nodes. It now returns True iff a node was found in the group. An optional callback for duplicated nodes can be used by callers to keep track of all nodes themselve. * The `_chaininfocache` of `revlog` classes has been changed from a dict to a LRU cache.